paleontology earth history
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Paleontology Earth History. What is Evolution. Genetic change over time Resulting in new species There is more to evolution than Change Trees change, mountains change Evolution is a change in genes that control traits in an organism. Why. The Environment changes

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Presentation Transcript
what is evolution
What is Evolution
  • Genetic change over time
  • Resulting in new species
  • There is more to evolution than Change
  • Trees change, mountains change
  • Evolution is a change in genes that control traits in an organism
slide3
Why
  • The Environment changes
  • A trait which is good for one environment may not be good for different environment
  • Basketball v. Football
  • Playing a guitar v. Flute
  • Geometry v. Algerbra
how do changes take place
How do changes take place
  • Natural Selection
    • Nature chooses
    • Conditions in nature select for traits in organism which will make that organism the most successful.
    • Selected for…Passed on
    • Selected against…extinct
natural selection v artificial selection
Natural Selection v. Artificial Selection
  • Natural…Nature chooses
  • Artificial Selection…Humans choose
artificial selection
Artificial Selection
  • All that you see are things that humans have chosen
  • The stuff you don’t see are items we have not selected for…they may become extinct...or retro in twenty years.
  • Music, clothes, TV, etc. Anything “popular” has been selected for. The unpopular…not around.
natural selection how does it work
Natural Selection…How does it work?
  • More organism are born than can survive.
  • All of the organisms (offspring) will have genetic changes due to sexual reproduction and mutation
  • Some of these changes will be beneficial to an organism. These benefits lead to a stronger organism.
  • These stronger traits are pass down to future generations.
paleontology
Paleontology
  • What happened
  • Why did it happen
  • When did it happen
  • Order of occurrence
uniformitarianism
Uniformitarianism
  • Process going on today have been going on since the earth formed 4.5 bya
    • Weathering
    • Erosion
    • Plate Tectonics
relative dating
Relative Dating
  • No…its not something they do in Kentucky
  • Compare several items of first to occur to last to occur
  • No exact age is applied
  • I am older than you. My dad is older than me
absolute dating
Absolute dating
  • How many years ago
  • Assign and age to a fossil
how to assign age
How to assign age
  • Tree rings
  • Radioactive decay
    • Process by which a radioactive material becomes stable
    • Nothing effects the rate of decay
    • Excellent tool to measure age
    • Isotope (parents) decay (become stable) into daughter C-14 decays into N-14
cladistics
Cladistics
  • Uses absolute age
  • Uses DNA (comparative Genetic Material)
  • Create a Logical progression of the evolution of similar species
slide35
SPECIES TIME PERIOD

Ardipithicus ramidus 5 to 4 million years ago Australopithecus anamensis 4.2 to 3.9 million years ago

Australopithecus afarensis 4 to 2.7 million years ago

Australopithecus africanus 3 to 2 million years ago

Australopithecus robustus 2.2 to 1.6 million years ago

Homo habilis 2.2 to 1.6 million years ago

Homo erectus 2.0 to 0.4 million years ago

Homo sapiens archaic 400 to 200 thousand years ago

Homo sapiens neandertalensi 200 to 30 thousand years ago

Homo sapiens sapiens 200 thousand years ago to present

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